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Sri Sutopo
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Journal : Jurnal Penelitian Hasil Hutan

 1 
KAJIAN TEKNIS PRAKTEK UJI COBA SISTEM TEBANG JALUR DAN TANAM INDONESIA Djaban Tinambunan; Sri Sutopo
Jurnal Penelitian Hasil Hutan Vol 13, No 6 (1995): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1995.13.6.222-230

Abstract

The investigation of three concessionaires in Kalimantan practicing the trial of Indonesian Strip Cutting and Planting System was conducted in 1994. All the companies are in the early stage of the trial and, therefore, the focus of investigation is limited to trial preparation and timber harvesting with the aim of describing the real practices and various problems faced in the field.It is found that the productivity of each activity in preparation and timber harvesting in the Indonesian Strip Curing and Planting System (A) is lower than those in the Indonesian Selective Cutting and Planting System (B). The comparison of several productivities are as follows : (I) Felling: 47 cu. m/day forA and 85 cu. m/day for B: (2) Skidding : 37 cu.m/day for A and 85 cu.m/day for B; (3) Loading-unloading : 55 cu.m/day for A and 150 cu.m/day for B; (4) Hauling :. 50 cu.m/trip forA and 64 cu.m/trip for B. The above figures and observation in the field lead to the notion of several problems faced such as : (1) in matching the required strip direction and real field condition ; (3) improper skill of workers; (4) unsuitable wage system; (5) inability to utilize the small diameter logs; (6) too large cable used for skidding; (7) too large log clamp available on loader tractor: (8) difficulty in handling small diameter logs onto logging truck; and (9) high percentage of land area disturbed due to large equipment and strip width limitation.The trial is still in the early stage and the information is very limited and therefore, further investigations is strongly recommended to cover more locations and aspects so that the final results can be used by the authority to make sound conclusions in selecting the final arrangement of the Indonesian Strip Cutting and Planting System.
KESESUAIAN ALAT DAN MESIN UNTUK PENGUSAHAAN HUTAN TANAMAN INDUSTRI Sri Sutopo; Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4879.993 KB) | DOI: 10.20886/jphh.1995.13.1.27-36

Abstract

Several short  investigations   have  been conducted   lo find the suitability  of equipment and machine   used in foreste  estate  operations.   Original  condition  of  land,  soil cultivation practices, and the productivity  of various  equipment   were also collected.The areas  used  for linber   estate  are  usually   alang-alang  grassland  with  the alang-alang densitv  of around  two million  stems/ha,   the average slope of  8%,   consited  of red yellow to red brown podsolik soils. the soil is plowed  twice hy  using  disc plow of 70 cm diameter  with the plowing  depth  of  20-30 cm.   and then harrowed  by using  disc  harrow of 46 cm diameter  with the harrowing  depth  of  15-20  cm.The  efective  power  used for plowing  is around  25 HP and  for  harrowing  is  around 19 HP. Therefore  the engine power  required  (with  50%  efficiency)  is around 50 HP.   For harrowing with  this level of power,   the  harrow  can  be  extended  up  10   4.8  m  wide  to  increase power efficiency,Felling productivities  by using  chainsaw and feller-buncher    are  7.096  and  7. 708 m3/hour, respectivelv,   The  difference  between  these  two  figures   is  not   significant.    While the skidding productivities   by  using  tractor   (140 HP)  and feller-buncher   are  4.929  and  5.140  m3/hour, respectively,   The  difference between this two figures  is highly  significant.Tge  relationship  between  the  power   of  tractor   and  productivity   is  linear  with  higher productivity   when the power  is larger.   Other  result shows that the tractor  used   are mostly too large and,  therefore,  need the  modification  of plow  and harrow combinations.
Co-Authors Djaban Tinambunan